<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>JS的三种引入方式</title>
</head>
<body>

        <button onclick="console.log(666)">点击即玩</button>
        <button onclick="alert(888)">点击即玩</button>

<script>
   var a= 1;
   var b = 3.14;
   var c = '你们';
   var e = true
   console.log( a, b, c, e);
   console.log(typeof a,typeof b,typeof c,typeof d,typeof e);
</script>
</body>
</html>